I decided that frezzing most of the water motion would convey the turbulence better than a more traditional "silky" look. Light in the foreground was not great, so I cranked the ISO up to 400 and set the aperture for f/11. The shutter speed was 1/640. The silky look in the background was more from mist rather than moving water.
The camera is my still useful 1DMkii. The lens was the Tamron 28-300 with image stabilization. Within its limitations, I like it as much as my "L" lenses.
It is nice to see water looking like water - what shutter speed did you use? ...and what ISO did you need to get it?
I think that, for many water shots, tilt can give DOF at high shutter speeds in deep, dark ravines.